What operating system are you using just to be clear?
When you are typing have you tried pushing the small button just above your touch pad? Once you press this it should change the light from blue to orange and turn off your touch pad. Even touch these slightly when your typing can have a big effect depending on how you type. Try this when your typing and see if it helps.
The next step if your still having problems would be to reinstall the drivers for the touch pad and keyboard.
Let me know and ill get back to you.